2010 Lexus HS250h warning light

504
5-2. Steps to take in an emergency
Have the vehicle inspected by your Lexus dealer immediately.
Failure to investigate the cause of th e following warning may lead to the
system operating abnormally and possibly cause an accident. Have the
vehicle inspected by your Lexus dealer immediately.
Wa r n i n g m e s s a g eDetails
(Flashes and
then remains
on)
Indicates a malfunction in the tire pressure warning
system
The tire pressure warning light comes on after flash-
ing for 1 minute.

5
When trouble arises
513
5-2. Steps to take in an emergency
Have the malfunction repaired immediately
After taking the specified steps to correct the suspected problem, check
that the warning message and light go off.
Interior buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure
Once
(Flashes)
The electronic key
is not detected
when an attempt
is made to start
the hybrid system.Start the hybrid
system with the
electronic key
present.
Once3 times
(Flashes)
The electronic key
was carried out-
side the vehicle
and a door other
than the driver's
door was opened
and closed while
the “POWER”
switch was in a
mode other than
off.
Bring the elec-
tronic key back
into the vehicle.
The electronic key
was carried out-
side the vehicle
and the driver’s
door was opened
and closed while
the shift position P
was selected with-
out turning off the
“POWER” switch.
Tu r n t h e
“POWER” switch
off or bring the
electronic key
back into the vehi-
cle.

520
5-2. Steps to take in an emergency
■Warning light display in radar cruise mode
In the following cases, the warning light may
not be displayed even if vehicle-to-
vehicle distance decreases:
●When your vehicle and the vehicle ahead are traveling at the same speed or the
vehicle ahead is traveling more quickly than your vehicle
●When the vehicle ahead is traveling at a very low speed
●Immediately after cruise control speed is set
●At the instant the accelerator pedal is depressed
■After changing the engine oil (U.S.A. only)
Make sure to reset the oil maintenance data. ( P.
4 2 6 )

526
5-2. Steps to take in an emergency
Firmly tighten each wheel nut two
or three times in the order shown
in the illustration.
Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
Stow the flat tire, tire jack and all tools.
■The compact spare tire
●The compact spare tire is identified by the label “TEMPORARY USE ONLY”
on the tire sidewall. 
Use the compact spare tire temporarily, and only in an emergency.
●Make sure to check the tire inflatio n pressure of the compact spare tire. 
(  P. 555 )
■After completing the tire change
The tire pressure warning system must be reset. ( P.
4 3 9 )
■When using the compact spare tire
As the compact spare tire is not equipped with a tire pressure warning valve and
tr

ansmitter, low inflation pressure of the spare tire will not be indicated by the tire
pressure warning system. Also, if you repl ace the compact spare tire after the tire
pressure warning light comes on, the light remains on.
■If you have a flat front tire on a road covered with snow or ice
Install the compact spare tire on one of the rear wheels of the vehicle. Perform the
fo
llowing steps and fit tire chains to the front tires:
Replace a rear tire with the compact spare tire.
Replace the flat front tire with the tire removed from the rear of the vehi -
cle.
Fit tire chains to the front tires.

5
When trouble arises
541
5-2. Steps to take in an emergency
If your vehicle overheats
Correction procedures
■If the engine coolant temperature warning light comes on or flashes
Stop the vehicle in a safe place an d turn of
f the air conditioning
system.
Check to see if steam is coming out from the engine area.
If you see steam: 
Stop the hybrid system. Carefu lly lif
t the hood after the steam
subsides and then restart the hybrid system.
If you do not see steam:
Leave the hybrid system operating and carefully lift the hood.
Remove the engine compartment cover. ( P. 4 2 3 )
Check to see if the cooling fans are operating.
If the fans are operating: 
Wait until the high engine coolant temperature warning light goes
of
f and then stop the hybrid system.
If the fans are not operating: 
Stop the hybrid system immediately and call your Lexus dealer.
The following may indicate that your vehicle is overheating:
●The high engine coolant temperature warning light comes on or
flashes: 
The engine may be overheating.
● “HYBRID S
YSTEM OVERHEAT” is sh own on the multi-information
display: 
The power control unit may be overheating.
Follow the correction procedure as described below.

592
Alphabetical index
Alphabetical index
A/CAir conditioning filter .......................450
Automatic air conditioning 
system .................................................. 252
ABS............................................................. 225
AFS .............................................................. 185
Adaptive front lighting system ......... 185
Air conditioning filter ......................... 450
Air conditioning system Air conditioning filter .......................450
Automatic air conditioning 
system .................................................. 252
Airbags Airbag operating 
conditions.................................. 106, 107
Airbag precautions for your 
child.......................................................... 110
Airbag warning light ........................ 493
Curtain shield airbag operating 
conditions.............................................107
Curtain shield airbag 
precautions .......................................... 110
Front passenger occupant 
classification system......................... 115
General airbag precautions ........... 110
Locations of airbags.......................... 103
Modification and disposal of 
airbags .....................................................114
Proper driving po sture ............. 101, 110
Side airbag operating 
conditions.............................................107
Side airbag precautions .................... 110
Side and curtain shield airbags 
operating conditions ......................107
Side and curtain shield airbags 
precautions .......................................... 110
SRS airbags ........................................... 103 Alarm ............................................................ 98
Antenna .................................................... 270
Anti-lock brake system ...................... 225
Armrest .....................................................377
Audio input.............................................. 307
Audio system
Antenna...................................................270
Audio input ........................................... 307
Audio visual input.............................. 307
AUX adapter ...................................... 307
CD player .............................................. 273
CD player/changer .......................... 273
MP3/WMA disc................................. 281
Optimal use ......................................... 304
Portable music player ..................... 307
Radio ....................................................... 265
Steering wheel audio switch........308
Audio visual input ................................. 307
Automatic air conditioning system Air conditioning filter ....................... 450
Air conditioning system ..................252
Automatic air conditioning 
system...................................................252
Automatic headlight leveling 
system ......................................................187
Automatic light control system........ 183
AUX adapter ......................................... 307
Auxiliary box .......................................... 370A

594
Alphabetical index
Child-protectors ......................................58
CleaningExterior ................................................... 402
Interior .....................................................406
Seat belts................................................ 407
Clock ......................................................... 373
Coin holder .............................................366
Compass ................................................... 391
Condenser ..............................................430
Console box ...........................................365
Cooling system Engine overheating ............................541
Cruise control Cruise control .......................................201
Dynamic radar cruise control .....205
Cup holders ............................................ 367
Curtain shield airbags.......................... 103
Customizable features ....................... 572
Daytime running light system ........... 186
Defogger Rear window ........................................260
Side mirrors ..........................................260
Dimensions............................................. 548
Dinghy towing ........................................248 Display
Dynamic radar cruise 
control ................................................. 205
Multi-information display ................ 169
Trip information.....................................172
Warning message ..............................501
Do-it-yourself maintenance ...............416
Door courtesy lights Door courtesy lights ........................ 360
Wattage ................................................. 556
Doors Door glasses........................................... 86
Door lock ................................ 44, 54, 57
Rear door child protector................ 58
Side doors................................................. 57
Side mirrors............................................. 83
Driver’s seat belt reminder light ..... 495
Driver’s seat position memory ........... 68
Driving Break-in tips........................................... 137
Correct posture.....................................101
Procedures............................................. 136
Winter driving tips .............................244
Driving position memory...................... 68
D

595
Alphabetical index
Electric power steering ......................225
Electronic keyIf the electronic key does not 
operate properly ............................ 533
Emergency, in case of If the electronic key does not 
operate properly ............................ 533
If the engine will not start ...............530
If the hybrid system will not 
start........................................................530
If the 12-volt battery is 
discharged ........................................ 536
If the warning buzzer sounds...... 492
If the warning light turns on .......... 492
If the warning message is 
displayed ............................................. 501
If you have a flat tire .......................... 521
If you lose your keys ........................ 532
If you think something is 
wrong................................................... 489
If your electronic key does 
not operate properly.................... 533
If your vehicle becomes stuck .... 545
If your vehicle needs to be  towed ................................................... 483
If your vehicle overheats.................. 541
Emergency flasher Switch ...................................................... 482 Engine
Accessory mode................................. 148
Compartment...................................... 422
Engine switch .........................................147
Hood ......................................................... 419
How to start the engine ....................147
How to start the hybrid 
system ....................................................147
Identification number ...................... 548
If the engine will not start............... 530
If the hybrid system will not 
start ....................................................... 530
Ignition switch ........................................147
Overheating .......................................... 541
Power switch..........................................147
Engine compartment cover ............. 423
Engine coolant Capacity .................................................552
Checking ...............................................428
Preparing and checking before winter .................................... 244
Engine/power control unit coolant Capacity .................................................552
Checking ...............................................428
Preparing and checking before winter .................................... 244
Engine immobilizer system.................. 96E